本帖最后由 td456 于 2010-4-14 12:28 编辑 ) c9 g9 r5 x; J7 ]; K& c9 x + r, l6 `( R; P5 A2 j4 {8 PWe all know that if you want to change the rotation of a three phase AC motor.3 r- Z/ H2 T. l: e/ r" D. f
Just swap any of the two phase leads. 9 S3 @7 L4 R% P: g) a- z9 ?# PBut for VFD application you need to do the swap after the inverter.0 ], G9 e, D! [9 u3 s
If you swap the leads before the inverter, it will not work.
. [% h' k4 b4 p6 N" vAs the principal of the VFD works, bascially from AC to DC, then DC to AC. + n" Y' X* |8 j% F+ q% o k: X
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The phase rotation of the output of the VFD connecting to the motor is based on the sequence "open" or "close" controlled by the inverter pre-set inside; any changes to the phase rotation of the feeder will not affect the DC rotation, as DC is NO phase at all. # @5 z. c8 g! j) u! M R3 |( ^; g( d' s3 |( l
The only thing you can change the rotation of the motor is the output side of the VFD, NOT the input of the VFD.